Golf Prosthesis Final Design Report (P13)

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Appendix

Initial Concept Development

Design Selection Process

Final concepts were selected by dividing the design into three subsystems. Those subsystems include gripping mechanisms, wrist action, and forearm attachment. We brainstormed several ideas for each subsystem and then narrowed those concepts down by using design matrices. The design matrices include design specifications such as price, weight, ease of use, interchangeability, reliability, aesthetics, and independent use.

The most weighted design specifications for wrist action, shown in Table 6, include ease of use, interchangeable, and independent use. These specifications are important because we want the user to be able to swing a golf club and hit a golf ball easily, attach/detach the device from each golf club, and they must use the device as independently as possible. The designs receiving the most points were the bevel gear and the magnetic design. Both of these designs rank the highest because they require less effort from the user.

Design matrix for wrist action
Table 6: Design matrix for wrist action

The most weighted design specifications for gripping mechanism shown in Table 7 were reliability and independent use. It is important that the golfer has full control of the golf club especially at impact. The grip should be secure and firm and the user must be able to change golf clubs as independently as possible. The designs receiving the most points were the TRS grip and the V-block. The TRS grip ranked high because it is an already existing design and is proven to work. The only problem is that it is meant for a single arm amputee. It is unknown if a bilateral amputee will experience the same amount of flexibility with the TRS grip as seen with single arm amputees. The V-block ranked high because it allows for an overlapping grip and is easily adjustable for choking up or down on the grip of the golf club.

Design matrix for gripping mechanisms
Table 7: Design matrix for gripping mechanisms

More specific concepts were developed using the top subsystem designs. These designs include: slotted wrist, pre-set wrist, magnetic pre-set wrist, and bevel gear. Each concept will be further explained in the upcoming paragraphs.

Top Concepts

Slotted Wrist

The slotted wrist is a completely original idea that was inspired by the need for double arm amputees to find a way to hinge their wrists during the golf swing. Our final design incorporates many new features that are additions to our original conceptual design. These additions include a quick release feature and a redesigned arm bar that provides the user with better control of the golf club during their swing, show below in Figure 35.

Final slotted wrist design using realistic materials
Figure 35: Final slotted wrist design using realistic materials.

The heart and soul of this design is based around the slotted wrist component. This device allows the user to hinge the club by contracting their bicep, creating a wrist-like motion that ultimately creates a more natural looking golf swing for double arm amputees who have minimal to zero wrist function.

Our final design will be manufactured using a variety of different techniques. For example, the arm bar and wrist attachment of the slotted wrist will be machined using a CNC HAAS mill and will made from aluminum. In contrast, the slotted wrist will be made from carbon fiber using a hand layup process, where layers of carbon fiber will be molded along outside of a positive mold shaped like the internal cavity of the slotted wrist, shown in Figure 36.

Fully assembled slotted wrist design which incorporates
Figure 36: Fully assembled slotted wrist design which incorporates a resigned arm bar, quick release, and wrist attachment, providing complete control of the golf club for the user

The final component of our design, the quick release, will be purchased online  and then welded to the wrist attachment.

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